Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual 3º round tem um 1º round de —?
 ###Tabelas: CREATE TABLE playoffs (playoffs_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, 1st round VARCHAR, 2nd round VARCHAR, 3rd round VARCHAR, Finals VARCHAR) CREATE TABLE championship_game_results_by_team (championship_game_results_by_team_id AUTO_INCREMENT PRIMARY KEY, Appearances INT, School VARCHAR, Wins INT, Losses INT, Percent VARCHAR, Last Appearance VARCHAR) CREATE TABLE chevy_rock__&__roll_400 (chevy_rock__&__roll_400_id AUTO_INCREMENT PRIMARY KEY, Pos. INT, Car # INT, Driver VARCHAR, Make VARCHAR, Team VARCHAR) CREATE TABLE assembly_segments (assembly_segments_id AUTO_INCREMENT PRIMARY KEY, Constituency number VARCHAR, Name VARCHAR, Reserved for ( SC / ST /None) VARCHAR, District VARCHAR, Number of electorates (2009) INT) CREATE TABLE list_of_interchanges_and_features (list_of_interchanges_and_features_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Dist. from Origin VARCHAR, Dist. from Terminus VARCHAR, Speed Limit VARCHAR, Location (all in Nagano ) VARCHAR)  
SELECT 3rd round FROM playoffs WHERE 1st round = —